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| author | David Müller <d.mueller@elsoft.ch> | 2016-04-27 11:58:32 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-01 12:17:02 -0700 |
| commit | b12e9085e3f51258481604c4c12af523dd1e5247 (patch) | |
| tree | 7978297f0f9e8f61e25f485d5774021d783566cb | |
| parent | af522524ca402d042e23bb88e919c40f0345dd91 (diff) | |
| download | linux-stable-b12e9085e3f51258481604c4c12af523dd1e5247.tar.gz linux-stable-b12e9085e3f51258481604c4c12af523dd1e5247.tar.bz2 linux-stable-b12e9085e3f51258481604c4c12af523dd1e5247.zip | |
serial: 8250_pci: fix divide error bug if baud rate is 0
commit 6f210c18c1c0f016772c8cd51ae12a02bfb9e7ef upstream.
Since commit 21947ba654a6 ("serial: 8250_pci: replace switch-case by
formula"), the 8250 driver crashes in the byt_set_termios() function
with a divide error. This is caused by the fact that a baud rate of 0 (B0)
is not handled properly. Fix it by falling back to B9600 in this case.
Signed-off-by: David Müller <d.mueller@elsoft.ch>
Fixes: 21947ba654a6 ("serial: 8250_pci: replace switch-case by formula")
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/8250/8250_pci.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 7cd6f9a90542..c1d4a8fa9be8 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1401,6 +1401,9 @@ byt_set_termios(struct uart_port *p, struct ktermios *termios, unsigned long m, n; u32 reg; + /* Gracefully handle the B0 case: fall back to B9600 */ + fuart = fuart ? fuart : 9600 * 16; + /* Get Fuart closer to Fref */ fuart *= rounddown_pow_of_two(fref / fuart); |